void SPI_init(char bidirectional_mode);
void SendCommand(char adress, word dato);
word ReadCommand(char addres);
void SPI_recursive(char addres, char *dato, char rw, char length);
extern word control_a, control_b, control_c, irq_status, rx_status, command_modem;
extern word version;
extern char rx_pkt_latch, cca_final;